I just created a post today about proper dose on Phosphate-E and how to do the math. Someone shot me the link to your calculator and I can't thank you enough. Bookmarked. Great Job.I put together a calculator to help with dosing the right amount of some of the popular liquid phosphate removers that are based on lanthanum chloride (Blue Life™ Phosphate Rx™, Brightwell® Aquatics Phosphat-E, Two Little Fishies PhosBan®-L, and Acrylic Tank Manufacturing Agent Green™):
http://larryl.emailplus.org/fish/dosing-instructions-phosphate-removers.html
Hope you find it helpful.